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Definitions

adverse

[ad-vurs, ad-vurs] / ædˈvɜrs, ˈæd vɜrs /
ADJECTIVE
unfavorable, antagonistic
Synonyms
STRONGEST
conflicting detrimental disadvantageous inimical injurious negative unfortunate unfriendly
WEAK
allergic to contrary down on down side have no use for inopportune opposed opposing opposite oppugning ornery reluctant repugnant stuffy unlucky unpropitious unwilling
Antonyms
STRONGEST
advantageous assisting beneficial friendly good helpful kind nice
WEAK
aiding auspicious favorable fortunate lucky propitious

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

CalMac warned of further disruption across the network due to adverse weather and urged anyone travelling to check their journey.

From BBC • Apr. 5, 2026

Subjects in studies of six individual peptides — growth hormone releasing peptide-2, ibutamoren mesylate, ipamorelin, CJC-1295, AOD-9604 and melanotan II — experienced adverse events, including death.

From Salon • Apr. 4, 2026

Firms said the negative effect of the war on sentiment added to the adverse impact of trade tariffs.

From The Wall Street Journal • Apr. 3, 2026

No serious adverse reactions were observed during the follow-up period of 6 to 12 months.

From Science Daily • Apr. 3, 2026

The one ever scrutinizing into the public opinion, and ready to follow where he could not lead it; the other insulting it by the most adverse sentiments and pursuits.

From "Founding Brothers: The Revolutionary Generation" by Joseph J. Ellis

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.